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Bug #12991

closed

[crunch2] Propagate memory limit from runtime constraints to docker container

Added by Tom Clegg over 6 years ago. Updated almost 6 years ago.

Status:
Resolved
Priority:
Normal
Assigned To:
Tom Clegg
Category:
-
Target version:
2018-02-14 Sprint
Story points:
1.0
Release:
Arvados 1.1.4
Release relationship:
Auto

Description

Current behavior: When a container tries to use more memory than it asked for, it competes with system processes, and the kernel OOM-killer sometimes kills system processes instead of the container.

Desired behavior: when a container tries to allocate more memory than specified in runtime_constraints, allocation fails and/or the container is killed. System processes (including crunch-run and slurmd) are not killed.

Explanation: We use the memory and cpu figures in container runtime_constraints to choose an appropriate node to run a container on (even taking kernel/system overhead into account), but we don't tell docker to limit the the container's memory use.

Proposed solution: We have an opportunity to do this in source:services/crunch-run/crunchrun.go L918:

        Resources: dockercontainer.Resources{
            CgroupParent: runner.setCgroupParent,
        },

(dockercontainer.Resources also has Memory and NanoCPUs fields)

The container's memory size (including swap) should be limited to the number of bytes given in runtime_constraints.

Subtasks 1 (0 open — 1 closed)

Task #13028: Review 12991-docker-memory-limitClosedTom Clegg02/06/2018Actions
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